Transformer structure



Dec. 15, 1936, w JAMES TRANSFORMER STRUCTURE 2 Sheets-Sheet 1 Filed Oct. 3, 1935 INVENTOR WzZ/zam 6. mes.

Dec. 15, 1936.' w. G. JAMES TRANSFORMER STRUCTURE Filed Oct. 5, 1955 2 Sheets-Sheet 2 INVENTOR WZZ/l'am 6 Jam 65.

WITNESSES:

Patented Dec. 15, 1935 UNITED STA'lEfi OFFICE TRANSFORMER STRUCTURE William G. James, "t

to Vestinghouse Er ddlescx, Pa assignor em in liiianufactnrfn3 Company, East Pittsburgh, Ea a corporation This invention relates to transformers and particularly to the assembly of the and coil structure of transformers.

In building transformers, it is desired to assemble the core iron tight enough to prevent vibration. of the core laminatlons and to so assemble the coils and insulation on the core that they are properly supported against stresses and caused by short circuits. core coil assembly heretofore employed is urnsa in that it is impossible to effect a permanent tight core and coil structure which capable of withstanding the vibrations and encountered.

An object of invention to provide for a rigidly assembled core and coil structure in a transformer.

A. more specific object of this invention is to provide an expansible member between the core 20 and coil structure of transformers whereby when it is expanded, it will tightly engage the and coils for maintaining them in a rigid oper able position capable of withstanding vibrations and stresses.

This invention, together with other and additional objects, may be better understood by reference to the accompanying drawings, in which Figure 1 is an elevational view partly in sec tion of the core and coil structure assembled in accordance with this invention,

Fig. 2 is a cross sectional view taken along the line II--II of the core and coil structure shown in Fig. l and assembled in acccrdanc with this invention,

Fig. 3 is a top plan view of the expansible member employed in accordance with this invention taken along the line IIL-III of Fig. 1, and

Fig. 4 is a cross sectional View taken along the line IV-IV of the expansible member shown in Fi 3.

In practicing this invention, an expansible member adapted for receiving a filling compound is so disposed between the core and coils of a transformer that when expanded it will tightly engage the core and coils to maintain them in a rigid operable position capable of withstanding vibration and vertical short circuit stresses.

As shown in the drawings and particularly in Figs. 1 and. the transformer core structure comprises the core I!) formed of laminatbns ii and supported by the usual frame structure Coils l3 are disposed around the tongue 9 of the core I for inducing a magnetic flux in the core. Insulation I4 comprising fuller boards or the 1935, Serial No. 43,373

like and spaces 55 of corrugated paper or the lilre are between the coils l3 around the core iii for insulating the coils and separating them to permit the circulation of a cooling medium therebetween. A. tongue wedge J of nonmagnetic material is provided. on the frame structure and is of suificient strength to support the entire static load of the core, coils insulation.

rcler to properly support the coils l3, insulZtblOi'l is and spacers [5 in their operative posit on. around the tongue 8 of the core Ii), an expansible member it is disposed between the core and he coils, insulation and The cx member iii, shown in Figs. and 4, is

of thin copper bearing steel. Other flexible metals, however, may be em- The expensible member may be fabricated in any suitable manner for providing a closed hollow member.

In order to provide for the expanding of the member l6, an inlet tube H is disposed in one end of the expensible member for admitting a filling compound. An outlet plug iii, the purpose of which will be explained hereinafter, is provided in the other end of the expansible member.

In practice, the expansible member may he placed on the core prior to the assembling of the coils on the core or because of its thinness, it may be easily inserted in the space formed between the core and coils after the coils are positioned on the core. When the expansible member is thus disposed between the core and the coils, a suitable filling compound such as sand, shot, plaster of Paris, glycerine and litharge, Smooth-on, neat or sand cement mixtures may be forced under pressure into it.

The filling compound may be forced into the expansible member by some suitable means such is shown in Fig. 1. In this embodiment, the filling compound is forced into the exp-ansible member It from a filling compound pot l9 which is connected to the expansible member !6 by the tube 26, valve 2| and inlet tube ll. Pressure is applied to the pot from some suitable source of supply of compressed air (not shown) through the tube 222 and valve 23 for forcing the filling compound from the pot into the expansible member.

In expanding the member, the outlet plug I8 is removed until the filling compound has been nod forced through the expansible member and starts to run out of the opening in which the plug is normally fitted. This insures the penetration for the full length of the expansible member by the filling compound. When the filling compound starts to run out of the opening, plug i is replaced therein to retain the filling compound in the expansible member.

When suificient filling compound is forced into the expansible member to support it in tight engagement with the core and coils, valve 2! is shut off and the filling compound in the expansible member is permitted to set or harden. After the filling compound in the expansible member hardens, the valve 2! and pot iii are disconnected from the inlet tube IT and the hardened filling compound present in the inlet tube is chipped out and a plug (not shown) is fitted therein to later exclude oil or other insulating liquids in which the core and coils may be immersed.

After the core and coil structures have been assembled in the manner hereinbefore described and placed in use, it may be found that further expansion of the expansible member is DGCQ sary. This is easily accomplished by removing the plug in the inl t pipe and reconnecting the valve and filling compound pot to the inlet tube and forcing more of the filling compound into the expansible member. Where a further expansion is necessary, it is preferrez that glycerine and litharge be employed as the filling compound regardless of the material used for the initial expansion of the member. This is because glycerine and litharge have a greater penetration power than the other compounds and easily penetrate into all parts of the expansible member either between the walls of the expansible member and the previously hardened compound or into spaces or interstices that may be present in the hardened or set compound.

In its expanded position the expansible member is in tight engagement with the core and coils, insulation and spacers. This is because the metal from which the expansible member is fabricated is flexible enough to conform with the irregularities of the insulation and iron surfaces with which it comes into contact. Thus, the expansible member supported by the set or hardened filling compound eifectively supports the coils, insulation and spacers in their operable position about the core in such a rigid relation that they are not affected by the stresses caused by short circuits.

Although this invention has been described with reference to a particular embodiment thereof, it is, of course, to be understood that other modifications thereof are possible. This invention is, therefore, not to be restricted except insofar as is necessitated by the prior art and the scope of the appended claims.

I claim as my invention:

1. In a transformer having a core and coils, in combination, an expansible metal member disposed between the core and coils, means comprising a filling material in the expansible metal member for supporting the expansible metal member in tight engagement with the core and coils, said metal member being capable of accommodating itself to the shape of the engaged portion of the core and coils.

2. In a transformer having a shell type core and coils disposed around the tongue thereof, in combination, an expansible metal member disposed between the tongue of the core and the coils, the expansible metal member being of a length and Width substantially equal to the length and width of the tongue of the core and means comprising a filling compound in the expansible metal member for supporting the expansible metal member in tight engagement with the core and coils.

3. In a transformer having a core and coils, in combination, an expansible metal member disposed between the core and coils, means for supporting the expansible metal member in tight engagement with the core and coils, said means comprising a filling compound forced into the expansible metal member to expand it and support it in tight engagement with the core and coils.

at. In a transformer having a core and coils, in combination, an expansible metal member disposed between the core and coils, means for supporting the expansible metal member in tight engagement with the core and coils, said means comprising a filling compound forced under pressure into the expansible metal member to expand it, the filling compound being so adapted to harden or et that when the forcing pressure is r moved the hardened filling compound supports the said metal member in tight engagement with the core and coils.

5. In a transformer having a core and coils, in combination, a tubular expansible metal member disposed between the core and coils, means comprising a filling material for filling the tubular metal member, and means for filling the tubular metal member with the filling material to support it in an expanded position in tight engagement with the core and coils, said metal member being capable of accommodating itself to the shape of the engaged portion of the core and coils.

WILLIAM G. JAMES. 

